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📄 libplatform-export.h // Copyright 2016 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_ #define V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_ #if defined(_WIN32) #ifdef BUILDING_V8_PLATFORM_SHARED #define V8_PLATFORM_EXPORT __declspec(dllexport) #elif USING_V8_PLATFORM_SHARED #define V8_PLATFORM_EXPORT __declspec(dllimport) #else #define V8_PLATFORM_EXPORT #endif // BUILDING_V8_PLATFORM_SHARED #else // defined(_WIN32) // Setup for Linux shared library export. #ifdef BUILDING_V8_PLATFORM_SHARED #define V8_PLATFORM_EXPORT __attribute__((visibility("default"))) #else #define V8_PLATFORM_EXPORT #endif #endif // defined(_WIN32) #endif // V8_LIBPLATFORM_LIBPLATFORM_EXPORT_H_	804 B	2025-03-03 12:36
📄 libplatform.h // Copyright 2014 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_LIBPLATFORM_LIBPLATFORM_H_ #define V8_LIBPLATFORM_LIBPLATFORM_H_ #include <memory> #include "libplatform/libplatform-export.h" #include "libplatform/v8-tracing.h" #include "v8-platform.h" // NOLINT(build/include_directory) #include "v8config.h" // NOLINT(build/include_directory) namespace v8 { namespace platform { enum class IdleTaskSupport { kDisabled, kEnabled }; enum class InProcessStackDumping { kDisabled, kEnabled }; enum class MessageLoopBehavior : bool { kDoNotWait = false, kWaitForWork = true }; enum class PriorityMode : bool { kDontApply, kApply }; /** * Returns a new instance of the default v8::Platform implementation. * * The caller will take ownership of the returned pointer. \|thread_pool_size\| * is the number of worker threads to allocate for background jobs. If a value * of zero is passed, a suitable default based on the current number of * processors online will be chosen. * If \|idle_task_support\| is enabled then the platform will accept idle * tasks (IdleTasksEnabled will return true) and will rely on the embedder * calling v8::platform::RunIdleTasks to process the idle tasks. * If \|tracing_controller\| is nullptr, the default platform will create a * v8::platform::TracingController instance and use it. * If \|priority_mode\| is PriorityMode::kApply, the default platform will use * multiple task queues executed by threads different system-level priorities * (where available) to schedule tasks. / V8_PLATFORM_EXPORT std::unique_ptr<v8::Platform> NewDefaultPlatform( int thread_pool_size = 0, IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled, InProcessStackDumping in_process_stack_dumping = InProcessStackDumping::kDisabled, std::unique_ptr<v8::TracingController> tracing_controller = {}, PriorityMode priority_mode = PriorityMode::kDontApply); /* * The same as NewDefaultPlatform but disables the worker thread pool. * It must be used with the --single-threaded V8 flag. / V8_PLATFORM_EXPORT std::unique_ptr<v8::Platform> NewSingleThreadedDefaultPlatform( IdleTaskSupport idle_task_support = IdleTaskSupport::kDisabled, InProcessStackDumping in_process_stack_dumping = InProcessStackDumping::kDisabled, std::unique_ptr<v8::TracingController> tracing_controller = {}); /* * Returns a new instance of the default v8::JobHandle implementation. * * The job will be executed by spawning up to \|num_worker_threads\| many worker * threads on the provided \|platform\| with the given \|priority\|. / V8_PLATFORM_EXPORT std::unique_ptr<v8::JobHandle> NewDefaultJobHandle( v8::Platform platform, v8::TaskPriority priority, std::unique_ptr<v8::JobTask> job_task, size_t num_worker_threads); /** * Pumps the message loop for the given isolate. * * The caller has to make sure that this is called from the right thread. * Returns true if a task was executed, and false otherwise. If the call to * PumpMessageLoop is nested within another call to PumpMessageLoop, only * nestable tasks may run. Otherwise, any task may run. Unless requested through * the \|behavior\| parameter, this call does not block if no task is pending. The * \|platform\| has to be created using \|NewDefaultPlatform\|. / V8_PLATFORM_EXPORT bool PumpMessageLoop( v8::Platform platform, v8::Isolate* isolate, MessageLoopBehavior behavior = MessageLoopBehavior::kDoNotWait); /** * Runs pending idle tasks for at most \|idle_time_in_seconds\| seconds. * * The caller has to make sure that this is called from the right thread. * This call does not block if no task is pending. The \|platform\| has to be * created using \|NewDefaultPlatform\|. / V8_PLATFORM_EXPORT void RunIdleTasks(v8::Platform platform, v8::Isolate* isolate, double idle_time_in_seconds); /** * Notifies the given platform about the Isolate getting deleted soon. Has to be * called for all Isolates which are deleted - unless we're shutting down the * platform. * * The \|platform\| has to be created using \|NewDefaultPlatform\|. * / V8_PLATFORM_EXPORT void NotifyIsolateShutdown(v8::Platform platform, Isolate* isolate); } // namespace platform } // namespace v8 #endif // V8_LIBPLATFORM_LIBPLATFORM_H_	4.4 KB	2025-03-03 12:36
📄 v8-tracing.h // Copyright 2016 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_LIBPLATFORM_V8_TRACING_H_ #define V8_LIBPLATFORM_V8_TRACING_H_ #include <atomic> #include <fstream> #include <memory> #include <unordered_set> #include <vector> #include "libplatform/libplatform-export.h" #include "v8-platform.h" // NOLINT(build/include_directory) namespace perfetto { namespace trace_processor { class TraceProcessorStorage; } class TracingSession; } namespace v8 { namespace base { class Mutex; } // namespace base namespace platform { namespace tracing { class TraceEventListener; const int kTraceMaxNumArgs = 2; class V8_PLATFORM_EXPORT TraceObject { public: union ArgValue { uint64_t as_uint; int64_t as_int; double as_double; const void* as_pointer; const char* as_string; }; TraceObject() = default; ~TraceObject(); void Initialize( char phase, const uint8_t* category_enabled_flag, const char* name, const char* scope, uint64_t id, uint64_t bind_id, int num_args, const char** arg_names, const uint8_t* arg_types, const uint64_t* arg_values, std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables, unsigned int flags, int64_t timestamp, int64_t cpu_timestamp); void UpdateDuration(int64_t timestamp, int64_t cpu_timestamp); void InitializeForTesting( char phase, const uint8_t* category_enabled_flag, const char* name, const char* scope, uint64_t id, uint64_t bind_id, int num_args, const char** arg_names, const uint8_t* arg_types, const uint64_t* arg_values, std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables, unsigned int flags, int pid, int tid, int64_t ts, int64_t tts, uint64_t duration, uint64_t cpu_duration); int pid() const { return pid_; } int tid() const { return tid_; } char phase() const { return phase_; } const uint8_t* category_enabled_flag() const { return category_enabled_flag_; } const char* name() const { return name_; } const char* scope() const { return scope_; } uint64_t id() const { return id_; } uint64_t bind_id() const { return bind_id_; } int num_args() const { return num_args_; } const char** arg_names() { return arg_names_; } uint8_t* arg_types() { return arg_types_; } ArgValue* arg_values() { return arg_values_; } std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables() { return arg_convertables_; } unsigned int flags() const { return flags_; } int64_t ts() { return ts_; } int64_t tts() { return tts_; } uint64_t duration() { return duration_; } uint64_t cpu_duration() { return cpu_duration_; } private: int pid_; int tid_; char phase_; const char* name_; const char* scope_; const uint8_t* category_enabled_flag_; uint64_t id_; uint64_t bind_id_; int num_args_ = 0; const char* arg_names_[kTraceMaxNumArgs]; uint8_t arg_types_[kTraceMaxNumArgs]; ArgValue arg_values_[kTraceMaxNumArgs]; std::unique_ptr<v8::ConvertableToTraceFormat> arg_convertables_[kTraceMaxNumArgs]; char* parameter_copy_storage_ = nullptr; unsigned int flags_; int64_t ts_; int64_t tts_; uint64_t duration_; uint64_t cpu_duration_; // Disallow copy and assign TraceObject(const TraceObject&) = delete; void operator=(const TraceObject&) = delete; }; class V8_PLATFORM_EXPORT TraceWriter { public: TraceWriter() = default; virtual ~TraceWriter() = default; virtual void AppendTraceEvent(TraceObject* trace_event) = 0; virtual void Flush() = 0; static TraceWriter* CreateJSONTraceWriter(std::ostream& stream); static TraceWriter* CreateJSONTraceWriter(std::ostream& stream, const std::string& tag); static TraceWriter* CreateSystemInstrumentationTraceWriter(); private: // Disallow copy and assign TraceWriter(const TraceWriter&) = delete; void operator=(const TraceWriter&) = delete; }; class V8_PLATFORM_EXPORT TraceBufferChunk { public: explicit TraceBufferChunk(uint32_t seq); void Reset(uint32_t new_seq); bool IsFull() const { return next_free_ == kChunkSize; } TraceObject* AddTraceEvent(size_t* event_index); TraceObject* GetEventAt(size_t index) { return &chunk_[index]; } uint32_t seq() const { return seq_; } size_t size() const { return next_free_; } static const size_t kChunkSize = 64; private: size_t next_free_ = 0; TraceObject chunk_[kChunkSize]; uint32_t seq_; // Disallow copy and assign TraceBufferChunk(const TraceBufferChunk&) = delete; void operator=(const TraceBufferChunk&) = delete; }; class V8_PLATFORM_EXPORT TraceBuffer { public: TraceBuffer() = default; virtual ~TraceBuffer() = default; virtual TraceObject* AddTraceEvent(uint64_t* handle) = 0; virtual TraceObject* GetEventByHandle(uint64_t handle) = 0; virtual bool Flush() = 0; static const size_t kRingBufferChunks = 1024; static TraceBuffer* CreateTraceBufferRingBuffer(size_t max_chunks, TraceWriter* trace_writer); private: // Disallow copy and assign TraceBuffer(const TraceBuffer&) = delete; void operator=(const TraceBuffer&) = delete; }; // Options determines how the trace buffer stores data. enum TraceRecordMode { // Record until the trace buffer is full. RECORD_UNTIL_FULL, // Record until the user ends the trace. The trace buffer is a fixed size // and we use it as a ring buffer during recording. RECORD_CONTINUOUSLY, // Record until the trace buffer is full, but with a huge buffer size. RECORD_AS_MUCH_AS_POSSIBLE, // Echo to console. Events are discarded. ECHO_TO_CONSOLE, }; class V8_PLATFORM_EXPORT TraceConfig { public: typedef std::vector<std::string> StringList; static TraceConfig* CreateDefaultTraceConfig(); TraceConfig() : enable_systrace_(false), enable_argument_filter_(false) {} TraceRecordMode GetTraceRecordMode() const { return record_mode_; } const StringList& GetEnabledCategories() const { return included_categories_; } bool IsSystraceEnabled() const { return enable_systrace_; } bool IsArgumentFilterEnabled() const { return enable_argument_filter_; } void SetTraceRecordMode(TraceRecordMode mode) { record_mode_ = mode; } void EnableSystrace() { enable_systrace_ = true; } void EnableArgumentFilter() { enable_argument_filter_ = true; } void AddIncludedCategory(const char* included_category); bool IsCategoryGroupEnabled(const char* category_group) const; private: TraceRecordMode record_mode_; bool enable_systrace_ : 1; bool enable_argument_filter_ : 1; StringList included_categories_; // Disallow copy and assign TraceConfig(const TraceConfig&) = delete; void operator=(const TraceConfig&) = delete; }; #if defined(_MSC_VER) #define V8_PLATFORM_NON_EXPORTED_BASE(code) \ __pragma(warning(suppress : 4275)) code #else #define V8_PLATFORM_NON_EXPORTED_BASE(code) code #endif // defined(_MSC_VER) class V8_PLATFORM_EXPORT TracingController : public V8_PLATFORM_NON_EXPORTED_BASE(v8::TracingController) { public: TracingController(); ~TracingController() override; #if defined(V8_USE_PERFETTO) // Must be called before StartTracing() if V8_USE_PERFETTO is true. Provides // the output stream for the JSON trace data. void InitializeForPerfetto(std::ostream* output_stream); // Provide an optional listener for testing that will receive trace events. // Must be called before StartTracing(). void SetTraceEventListenerForTesting(TraceEventListener* listener); #else // defined(V8_USE_PERFETTO) // The pointer returned from GetCategoryGroupEnabled() points to a value with // zero or more of the following bits. Used in this class only. The // TRACE_EVENT macros should only use the value as a bool. These values must // be in sync with macro values in TraceEvent.h in Blink. enum CategoryGroupEnabledFlags { // Category group enabled for the recording mode. ENABLED_FOR_RECORDING = 1 << 0, // Category group enabled by SetEventCallbackEnabled(). ENABLED_FOR_EVENT_CALLBACK = 1 << 2, // Category group enabled to export events to ETW. ENABLED_FOR_ETW_EXPORT = 1 << 3 }; // Takes ownership of \|trace_buffer\|. void Initialize(TraceBuffer* trace_buffer); // v8::TracingController implementation. const uint8_t* GetCategoryGroupEnabled(const char* category_group) override; uint64_t AddTraceEvent( char phase, const uint8_t* category_enabled_flag, const char* name, const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args, const char** arg_names, const uint8_t* arg_types, const uint64_t* arg_values, std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables, unsigned int flags) override; uint64_t AddTraceEventWithTimestamp( char phase, const uint8_t* category_enabled_flag, const char* name, const char* scope, uint64_t id, uint64_t bind_id, int32_t num_args, const char** arg_names, const uint8_t* arg_types, const uint64_t* arg_values, std::unique_ptr<v8::ConvertableToTraceFormat>* arg_convertables, unsigned int flags, int64_t timestamp) override; void UpdateTraceEventDuration(const uint8_t* category_enabled_flag, const char* name, uint64_t handle) override; static const char* GetCategoryGroupName(const uint8_t* category_enabled_flag); void AddTraceStateObserver( v8::TracingController::TraceStateObserver* observer) override; void RemoveTraceStateObserver( v8::TracingController::TraceStateObserver* observer) override; #endif // !defined(V8_USE_PERFETTO) void StartTracing(TraceConfig* trace_config); void StopTracing(); protected: #if !defined(V8_USE_PERFETTO) virtual int64_t CurrentTimestampMicroseconds(); virtual int64_t CurrentCpuTimestampMicroseconds(); #endif // !defined(V8_USE_PERFETTO) private: #if !defined(V8_USE_PERFETTO) void UpdateCategoryGroupEnabledFlag(size_t category_index); void UpdateCategoryGroupEnabledFlags(); #endif // !defined(V8_USE_PERFETTO) std::unique_ptr<base::Mutex> mutex_; std::unique_ptr<TraceConfig> trace_config_; std::atomic_bool recording_{false}; #if defined(V8_USE_PERFETTO) std::ostream* output_stream_ = nullptr; std::unique_ptr<perfetto::trace_processor::TraceProcessorStorage> trace_processor_; TraceEventListener* listener_for_testing_ = nullptr; std::unique_ptr<perfetto::TracingSession> tracing_session_; #else // !defined(V8_USE_PERFETTO) std::unordered_set<v8::TracingController::TraceStateObserver*> observers_; std::unique_ptr<TraceBuffer> trace_buffer_; #endif // !defined(V8_USE_PERFETTO) // Disallow copy and assign TracingController(const TracingController&) = delete; void operator=(const TracingController&) = delete; }; #undef V8_PLATFORM_NON_EXPORTED_BASE } // namespace tracing } // namespace platform } // namespace v8 #endif // V8_LIBPLATFORM_V8_TRACING_H_	10.81 KB	2025-03-03 12:36

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